Artificial tooth.



L. E. EI/SLIN'.

ARTIFICIAL TOOTH. APPLICATION FILED 0CT.-2I. 1910.

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LEO EvsLm, or new YORK, iv. 2., ASSIGNOR, BY itnsnn ASSIGNMENTS, T0 nonesrannnne, or PHILADELPHIA, rnnivsfnvnmn.

ARTIFICIAL TOOTH.

Specification of Letters Patent. Pate t d Aug. 28, felt.

Application filed October 21, 1910. Serial No. 588,379.

T 0 all whom it may concern:

Be it known that I, Lno E. EVSLIN, a subject of the Emperor of Russia,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Artiiicial Teeth,of which the following is aspecification.

This invention has reference to improvements in artificial teeth whereinis employed a in and metallic backing for the tooth and w erein it isintended that the pin and backing shall be interchangeable with teeth ofthe same kind. H

The invention has for its principal object to provide a metallic boxingor socket for the reception of the pin in the tooth, said boxing orsocket being preferably closed at its inner end; a box-envelop for theprotruding end of the pin at the back of the tooth, and a metallicbacking, the envelop and backing when assembled on the tooth and thebacking shaped to the tooth being easily removed in assembled relation,where I by the soldering together of the backing and envelop is greatlyfacilitated.

Figure 1 shows in section a bicuspid provided with a metallic boxing orsocket to receive a round in, the pin and box-envelop bein removed romthe tooth and the backing lying against and conforming to the back ofthe tooth;

Fig. 2 shows in section a tooth similar to Fig. 1 and also showing amodified form of envelop for the pin, the pin, envelop and backing inplace;

Fig. 3 shows a section of a front tooth with a porcelain bite. In thistooth the socket is formed to adapt itself to the best advantageunder-the porcelain bite, it therefore takes a curved d1rection in theinterior of the tooth. The envelop is similar to that shown in Fig. 2; r

Fig. 4; shows in section a front tooth with a porcelain bite, showing amodified form of pin, envelop and having a modified back; and.

Fig. 5 shows in section a front tooth simi lar to Fig. 4, except it hasa modified back and the pin is removed.

Reference being had to Fig. 1, 6 designates an artificial bodypreferably formed with a socket 7 extending inwardly into the tooth fromthe back, at a point approximately thetenter of the back and terminatingin the vicinity of the buccal-cusp. Baked in the tooth and in the socket6 thereof is a metallic-boxing or socket ,8, whichmay be either round orsquare, said boxing or socket opening out of the backof the tooth, as at9, and having its inner end closed at 10. 'When casting the tooth, theboxing or socket is built to adapt itself in the interior of the tooth,so that its closed end 10 is in the vicinity of the buccal-cusp.

The pin is longer than the .socket in the tooth, so that it willprotrude or extend a predetermined distance from the rear face of thetooth, for purposes which I will now explain: Adapted to fit over andcover the protruding end of pin 13 is what I term a box-envelop 15. Thisenvelop 15 is a tubular or rather dome-shaped body, open at one end andclosed at its other end, and around the open end of said envelop isprovided radial wings or a flange 16, which, when the envelop has beenplaced over the protruding end of the pin, will be seated in thedepression or seat 12 in the back of the tooth, which leaves the outsideface of the wings or flange l6 flush with the back of the tooth. Overthe envelop is placed the backing 17, said backing having an opening 18,conforming to the shape of envelop to be inserted therethrough, whichpermits the backing 17 to be placed in position on the backof the toothand be shaped thereto, as shown.

In operation, after the pin has been inserted into the tooth and thebox-envelop has been placed over the protruding end of the pin, thebacking is placed over the envelop and burnished to back of tooth andagainst the wings or flange of the envelop, and is then waxed up withhard wax to box the envelop. The envelop and backing may then beremoved, in assembled relation, from the pin and tooth, invested, waxremoved, and box-envelop and backing soldered together. That portion ofthe pin fitting in the socket of the tooth may be either cemented in thetooth, or baked in the tooth while the tooth is in a plastic state.

Figs. 2 and 3 illustrate the application of the invention to pin teethwhere an envelop is used which does .not have the wings or flange. -Withthis construction it matters little whether the envelop or backing isfirst applied, but when assembled and backing fitted to the tooth, thebacking and envelop may be held together with wax, and the envelop serveas a means to be gripped by a pair of tweezers or other instrument forremoving the envelop and backing as an entirety preparatory to finishingas described in Fig. 1. In Fig. 2 the tooth is designated 6, the pin 13,the envelop 15 and the backing as 17. In Fig. 3 the tooth is designated6", the pin 13, the envelop 15 and the backing as 17 Attention isparticularly called to the last mentioned figures, because the socket inits interior is formed to adapt it self to the best advantage under theporcelain bite; it therefore takes a curved direc tion in the interiorof the tooth. The ma tallic socket should be slightly larger in diameterthan the pin, to allow for the insertion of the pin.

Figs. l and 5 illustrate the application of the invention to teeth, hereshown as front teeth with a porcelain bite, where the pins have angularportions over which the envelops fit, although in Fig. 5 the env lop hasbeen omitted. The teeth are indicated as 6, the metallic-boxing orsockets as 8, the closed ends of which are preferably disposed at anacute angle and the rear face of the tooth, shown in Fig. 4:, isprovided with the grooves 20 to receive the flanges 21 of thebox-envelop 15. The backing is designated 17. The pin 13 is preferablysquare and its protruding end is bent approximately at right anglestoward the cervicalborder of the tooth, as at 22. Over the bent portion22 of the pin is adapted to be placed the envelop 15 with its flanges 21seated in to make interchangeable teeth of any teeth.

lVhat I claim is: 1. The mounting for a tooth having a socket and arecess at the opening of the socket, comprising a lining closed at itsin' ner end, a pin conforming to said socket and lining and having anelongation protruding from the socket, a member to cover said elongationof the pin, said member being of substantially the same contour as thepin and closed at its outer end, and having a flange to enter the recessat the opening of the socket, and a backing plate having an opening toadapt it to be passed over the member.

2. The combination with a tooth. having a socket formed therein, of apin for engaging in said socket and having a portion of its lengthprotruding out of said socket, an envelop for inclosing the protrudingend of said pin having a lateral'flange for engaging directly againstportions of the tooth. surrounding said socket, and a backing for thetooth having an aperture formed there through adapted to be insertedover the en velop so that portions of the backing sur' rounding theaperture may engage the lateral flange of the envelop, for the purposeset forth;

In testimony whereof I atfix my signature. in presence of tWo witnesses.

LEO E. EVSLIN.

Witnesses ROBERT Frown, CHAs. W. LA PoR'rE.

